<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 添加角色按钮区 -->
      <el-row>
        <el-col>
          <el-button type="primary" icon="el-icon-user">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区 -->
      <el-table :data="roleList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template v-slot="scope">
            <el-row
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
            >
              <el-col :span="1">&nbsp</el-col>
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag @close="removeRightById(scope.row,item1.id)" closable >{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级与三级权限 -->
              <el-col :span="18">
                <el-row
                  :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)" >{{
                      item2.authName
                    }}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      @close="removeRightById(scope.row,item3.id)"
                      closable
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                    >
                      {{ item3.authName }}</el-tag>
                    <!-- <i class="el-icon-caret-right"></i>    -->
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"> </el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" min-width="135">
          <template v-slot="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini"
              >编辑</el-button
            >
            <el-button type="danger" icon="el-icon-delete" size="mini"
              >删除</el-button
            >
            <el-button type="warning" icon="el-icon-setting" size="mini" 
            @click="showSetRightDialog(scope.row)"
              >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限的对话框 -->
        <el-dialog
    title="分配权限"
    :visible.sync="setRightDialogVisible"
    width="40%"
    @close="setRightDialogClosed"
    >
    <!-- 树形空间 -->
    <el-tree :data="rightsList" :props="treeProps" 
    show-checkbox 
    default-expand-all
    node-key="id"
    :default-checked-keys="defKeys"
    ref="treeRef"
    ></el-tree>
    <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary"  @click="allotRights" >确 定</el-button>
    </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //所有角色列表数据
      roleList: [],
      //控制分配权限对话框的显示与隐藏
      setRightDialogVisible:false,
      //所有权限的数据
      rightsList:[],
      //树形空间的属性绑定对象
      treeProps:{
        label:'authName',
        children:'children',
      },
      //默认选中的节点ID值数组
      defKeys:[],
      //当前即将分配权限的角色id
      roleId:'',
    };
  },
  created() {
    this.getRolesList();
  },
  methods: {
    //获取所有角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get("roles");
      if (res.meta.status !== 200) {
        return this.$message.error("");
      }
      this.roleList = res.data;
    },
    //根据ID删除对应的权限
    removeRightById(role,rightId) {
      //弹框提示用户是否要删除
      this.$confirm("此操作将永久删除该权限, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(async () => {
            const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if(res.meta.status!==200)return this.$message.error('删除权限失败！')
          this.$message({
            type: "success",
            message: "删除成功!",
          });
          //不要调用getRolesList(),会刷新整个页面
          role.children = res.data;
        })
        .catch(() => {
          this.$message({
            type: "info",
            message: "已取消删除",
          });
        });
    },
    //控制分配权限对话框
    async showSetRightDialog(role){
        this.roleId=role.id
        //获取所有权限数据
        const {data:res}=await this.$http.get('rights/tree')
        if(res.meta.status!==200)return this.$message.error('获取权限失败')
        //把获取到的权限数据保存到数组中
        this.rightsList=res.data
        //递归获取三级节点的ID
        this.getLeadfKeys(role,this.defKeys)
        this.setRightDialogVisible=true
    },
    //通过递归获取角色下所有三级权限的id，并保存到defKeys中
    getLeadfKeys(node,arr){
        //如果当前节点不包含children属性，则是三级节点
        if(!node.children){
            return arr.push(node.id) 
        }

        node.children.forEach(item => {
            this.getLeadfKeys(item,arr)
        });
    },
    setRightDialogClosed(){
        this.defKeys=[]
    },
    async allotRights(){

        const keys=[...this.$refs.treeRef.getCheckedKeys(),
        this.$refs.treeRef.getHalfCheckedKeys()
        ]
        const idStr=keys.join(',')
        const {data:res}=await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
        if(res.meta.status!==200)return this.$message.error('权限分配失败')
        this.$message.success('权限分配成功')
        this.getRolesList()
        this.setRightDialogVisible = false
    },
  },
};
</script>

<style lang="less" scoped>
.el-tag {
  margin: 8px;
}
.bdtop {
  border-top: 1px solid #ddd;
}
.bdbottom {
  border-bottom: 1px solid #ddd;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>